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<title>JavaScript NULL</title>
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<pre> <!-- Use pre element for work document.writeln() method -->
<script type="text/javascript">
var str = null; // Value assign null
document.writeln("str == undefined : " , str == undefined);
document.writeln("null == undefined : " , null == undefined);
document.writeln("null === undefined : " , null === undefined);
var bool = Boolean();
document.writeln("Default Boolean Context : ", bool); // Default Boolean context Returns false
var bool = Boolean(true);
document.writeln("True Boolean : ", bool); // Returns true
</script>
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